your not losing damage that is the point of misery, its dps neutral meaning it equal to 4 cast of glare 3 however without that change, whm did lose cause he used lilies since misery wasnt dps neutral but lower potency compare to 4 casts.
second its not a gain to use lilies without the aspect of actually need to heal but if we do comparison to using healing then whm mp cost is higher then all healers and then you need to compare the use of lilies between that and using a ogcd while the norm is casting gcd every moment in truth you can do ogcd without cast of gcd.
in truth the ogcd of the healers cost them the difference between mp spent on cast dps to the healing gcd and whm is in truth more painful.
when talking about good mp economy and management it means being more easy, efficient and most importantly recoverable.
in truth, whm management is the worst of the 3 cause:
1) his mp costs are higher then the other 3
2) all 3 have better recover then whm
3) technically speaking, using ogcd saves casting healing gcd next so it saved them that mp, so in terms of efficient they are better cause they keep the dmg and saved the diff between dps and heal.
in fact if misery was again overlooked it would be less efficient to use lilies again which may have been since we have glare 4 cant say that for sure.
mp economy whm is not efficient, its not better in fact the other 3 healers have better economy due to lower costs of mp and the ogcd that saves them the healing costs.
this all mp management and economy is also important to note, it wasn't made with direct purpose by the devs actually. it was due to lack of planning and design of his kit...
you want to claim the economy as in terms of saving mp might be higher number i guess it might but it also need to include the fact that whm mp costs are higher then the 3 sadly.
i will repeat what i said, lilies don't refund mp they save mp and even then they don't do it in a good way compare to the ogcd the other 3 haves.